diff --git a/lib/isc/unix/stdtime.c b/lib/isc/unix/stdtime.c
index 80e9f25547..e3fefad500 100644
--- a/lib/isc/unix/stdtime.c
+++ b/lib/isc/unix/stdtime.c
@@ -47,5 +47,5 @@ isc_stdtime_get(isc_stdtime_t *t) {
 
 	REQUIRE(ts.tv_sec > 0 && ts.tv_nsec >= 0 && ts.tv_nsec < NS_PER_S);
 
-	*t = (unsigned int)ts.tv_sec;
+	*t = (isc_stdtime_t)ts.tv_sec;
 }